- Cross-section of bark of the stem. S, suberous layer. PC, cortical parenchyma. L, liber. R, Dotted line extends to narrow medullary ray. O, stands opposite a tangential row of oxalate of calcium crystals, which are numerous throughout the phloem. C, Cambium.

This image is from Granatum in Sayre's Manual of Organic Materia Medica and Pharmacognosy, 1917.